8=-2(s-20)

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Solution for 8=-2(s-20) equation:


Simplifying
8 = -2(s + -20)

Reorder the terms:
8 = -2(-20 + s)
8 = (-20 * -2 + s * -2)
8 = (40 + -2s)

Solving
8 = 40 + -2s

Solving for variable 's'.

Move all terms containing s to the left, all other terms to the right.

Add '2s' to each side of the equation.
8 + 2s = 40 + -2s + 2s

Combine like terms: -2s + 2s = 0
8 + 2s = 40 + 0
8 + 2s = 40

Add '-8' to each side of the equation.
8 + -8 + 2s = 40 + -8

Combine like terms: 8 + -8 = 0
0 + 2s = 40 + -8
2s = 40 + -8

Combine like terms: 40 + -8 = 32
2s = 32

Divide each side by '2'.
s = 16

Simplifying
s = 16

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